The pinhole was made by the traditional dimple-and-sand method, using 0.001 inch brass shim stock and #400 wet-or-dry sandpaper wet. You create a dimple with the tip of the needle, flip the sheet over and sand gently with a circular motion. It is not necessary to actually pierce with the needle, nor does the needle have to be as small as the desired hole diameter. I use a scrap of mat board as backup when "operating." In the ideal case, the hole is left with a knife edge and perfectly round. It's an iterative process, slowly working up to the desired diameter (in my case, checked with a direct reading microscope in my possession for about 45 years!)
Originally Posted by m1tch
The finished pinhole plate was blackened with BlackenIt, a mysterious liquid found in model railroad oriented hobby shops.
1 mil shim stock is pretty flimsy to handle -- I might suggest 2 or 3 mil for a first try. There are assortments of several thicknesses found in some hobby shops, auto parts stores and hardware stores. Often a K&S brand found with other brass strips and shapes for model making.
Last edited by DWThomas; 11-30-2012 at 09:32 AM. Click to view previous post history.